#include <iostream>
#include <vector>
#include <iterator>
using std::vector;
using std::cout;
using std::endl;
void print(const vector<int>& vec)
{
for (auto element : vec) {
cout << element << ' ';
}
cout << std::endl;
}
int main()
{
vector<int> vec;
std::back_inserter(vec) = 1;
std::back_inserter(vec) = 2;
std::back_inserter(vec) = 3;
print(vec);
}
/*
run:
1 2 3
*/